From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 27 Dec 2023 10:44:05 +0000 (+0000)
Subject: bug 1155: add convenience SVSHAPE.is_triangle() function
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5bd6338cc9d9d9ef95438b069256d0a1b5742fe5;p=openpower-isa.git

bug 1155: add convenience SVSHAPE.is_triangle() function
---

diff --git a/src/openpower/decoder/isa/svshape.py b/src/openpower/decoder/isa/svshape.py
index 7876fda4..e6294fba 100644
--- a/src/openpower/decoder/isa/svshape.py
+++ b/src/openpower/decoder/isa/svshape.py
@@ -49,6 +49,10 @@ class SVSHAPE(SelectableInt):
         "REMAP Indexed Mode"
         return self.mode == 0b00 and self.submode2 in [0b110, 0b111]
 
+    def is_triangle(self):
+        "REMAP Triangle Mode"
+        return self.mode == 0b11 and self.skip in [0b00, 0b01]
+
     @property
     def submode2(self):
         return self.fsi['permute'].asint(msb0=True)
@@ -60,8 +64,8 @@ class SVSHAPE(SelectableInt):
     @property
     def order(self):
         permute = self.fsi['permute'].asint(msb0=True)
-        if self.is_indexed():
-            permute = (permute-0b110)*2 # xyz or yxz
+        if self.is_indexed() or self.is_triangle():
+            permute = (permute&0b001)*2 # xyz or yxz
         return SVP64SHAPE.order(permute)
 
     @order.setter
@@ -140,14 +144,14 @@ class SVSHAPE(SelectableInt):
 
     @property
     def skip(self):
-        if self.is_indexed():
+        if self.is_indexed() or self.is_triangle():
             inv = self.fsi['invxyz'].asint(msb0=True)
             return (inv & 0b100) >> 2
         return self.fsi['skip'].asint(msb0=True)
 
     @skip.setter
     def skip(self, value):
-        assert not self.is_indexed() # TODO
+        assert not (self.is_indexed() or self.is_triangle()) # TODO
         self.fsi['skip'].eq(value)
 
     @property